Blow-off valve.



PATENTED JULYlS, 1905.

N0. J. B. BARNES.

BLOW-OFF VALVE.

APPLICATION FILED JULY 29, 1904- k wk K) H AND mlamuuumwmmmmcmmrmw m m 1 NrrE STATES- Patented July 18, 1905.

ATENT Price,

BLOW-OFF VALVE.

SPECIFICATION forming part of Letters Patent No. 795,187, dated July 18, 1905.

Application filed July 29, 1904. Serial No. 218,742.

To all 11/71/0777 it 777/fI/Z/ concern:

Be it known that I, JOSHUA BARTLETT BARNns, a citizen of the United States, residing at Springfield, Illinois, have invented certain new and useful Improvements in Blow- Off Valves of which the following is a specilication.

The present invention relates to a blow-off valve to be used for blowing off steam and hot water from a steam-boiler.

Among the objects in view in devising the present invention are to provide a balanced valve and one in which the valve-seats may be readily removed and replaced, one in which a convenient and effective form of packing is provided, which with the entire cage and Valve parts may be readily removed and replaced, and in which the number of parts are reduced to a minimum and a device of extreme simplicity, durability, and efliciency secured.

WVith these and other objects in view the in vention includes the construction and arrangement of parts hereinafter described, the novel features and combinations being set forth in the appended claims.

An embodiment of the invention is illustrated in the accompanying drawings, in whicl Figure 1 is a side elevation, and Fig. 2 a plan view. Fig. 3 is a vertical sectional view.

In the drawings the letter A designates a valve-casing having coupling branches A and A and an upwardly-extending cylindrical portion A, which forms a guide for the upper chamber is provided with a space or recess extending entirely around the cage water and steam are admitted therethrough equally over its entire periphery, thus balancing the valve perfectly. A bell-metal ring F is seated in a rabbet in the sleeve E and has a rounded upper edge adapted to contact with a composition packing-ring inserted in a groove in the lower edge of the valve-body. At its upper end the spring O bears against a brass vibrating ring, cup, or follower, which has its upper beveled edge bearing against the corresponding beveled edge of a composition packingring H. The upper edge of the packing-ring may also be beveled and bear against the portion of the casing where it extends inward into contact with the valve-body, as shown. The upper end of the valve is closed, and an operating-lever K is connected thereto by a suitable lug-and-pin connection, as indicated at J. The lever may, as shown at K, be linked to a projection from the valvecasing. In order to limit the amount to which the valve may be raised, stops N and O are provided on the lever K and projection J.

Such a construction as that above described is extremely simple, durable, and effective and possesses many advantages. It is a balanced valve, and therefore easily operated, and the seats can be removed and replaced without destroying the cylindrical valve proper. Further, the valve being made in a cylindrical form with a cavity therein the hot water and steam surrounds the valve, keeping it warm inside and out when it is closed, so that no drippings coming from the valve around the seat can be allowed to freeze. The packing makes a perfectly steam -tight joint, being held both by the spring and the pressure of the steam.

Of course when this valve is pulled open and blowing against the atmosphere the spring takes care of the resistance of the atmosphere, and should the pressure become greater than the spring could bear crushing this spring upward is prevented by the stops above described. \Vhen the valve is opened,thc outrush of steam striking the atmosphere reacts against the open end or cavity of the valve, and the function of the spring is to afford a yielding resistance between the back pressure and the packing, so as to protect this packing from. damage, owing to the back pressure which results when the steam strikes the atmosphere and reacts upon the cavity of the valve. Then, again, the brass nut may be removed from crum-pin the hand-lever may be utilized to the bottom at any time and the entire cage, spring, and valve taken out without interfering with any other part of the valve, there being, in fact, nothingelse to disturb.

The simplicity,durability, and positive opening and closing of this valve on its seats, the lower being made of bell-metal and the upper ring of a suitable composition, and the ease with which they can be removed and replaced without any grinding and fitting to secure a perfect seat are features rendering the valve of great value.

At the slightest opening of the valve steam and hot water will rush through the holes at the lower edge, blowing away all sediment or dirt, and this action is continued until the closing of the valve, always securinga perfect seating of the valve. Also the packing surrounding this valve-chamber is indestructible when put in of the right material and with all angles with which the valve is constructed prevents any friction at point of contact, as there would probably be if there were two metals.

The lower cage of this valve is simply a guide with no friction, simply keeping it to its place.

It will be noticed that by moving the fulturn the valve so as to secure a grinding action of the composition ring upon the upper tapered edge of the valve-seat. This will break down or remove any particles which may accumulate, and the tapered form of the seat will allow these particles to fall to one side away from the seat proper.

Having thus described my invention, what I claim is- 1. A blow-off valve comprising a valve-casing having inlet and discharge brancheswith their axes at right angles to each other and having an extension opposite the discharge branch, and axially in line therewith, a sleeve removably seated within the discharge branch and carrying a valve-seat at its inner end, a cylindrical piston-valve passing to the outside through the said extension and at its inner end resting on the seat and adapted to be removed through the discharge-opening upon the removal of the sleeve, means for operating the valve connected with its outer end, packing material between the valve and the extension of the casing and a spring bearing upon the packing at one end and upon the valve at the other end, the said casing having an annular enlargement about the valve and l means extending across the said enlargement for guiding the valve, and between which and the valve the spring is located, substantially as described.

2. A blow-off valve comprising a valve-casing having inlet and discharge branches with an extension axially in line with, but opposite to the discharge branch, the shell of said extension inclining inwardly and having an opening for the passage of a cylindrical valve, a sleeve removably held in the discharge-branch and having a valve-seat. a cylindrical valve having an outwardly-extending flange at its lower end to rest on the seat and having its upper end passing between the inclined walls of the extension to the outside, means connected with the outer end of the valve for operating the same, packing between the valve and the inclined walls, said casing having an annular enlargement, means extending across the same for guiding the valve, and a spring arranged between the valve and the said guiding means and bearing at its ends upon the packing and flange respectively, substantially as described.

3. In combination, in a steam-boiler blowoff valve a casing having an inlet and an outlet branch, andan opening opposite to and in line axially with the outlet branch, a hollow cylindrical valve arranged across the axis of the inlet branch and extending from the seat at the outlet branch through the said opposite opening of the casing, said valve being open at its end toward the outlet adjacent the seat, packing between the valve and the wall of the casing and a spring bearing on the valve at one end and upon the packing at the other end, substantially as described.

4. In combination, in a steam-boiler blowoff valve a casing having an inlet and an outlet branch with a valve-seat about the outletopening,a hollow piston-valve passing through the casing at one end and at its other end resting on the seat with said end adjacent said seat open and exposed to the back pressure from the outlet and a chamber within the easing surrounding the valve to heat the same, whereby the hollow interior of said valve will also be warmed about the seat and adjacent the discharge, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

JOSHUA BARTLETT BARNES.

\Vitnesses:

E. R. JEFFERY, A. B. MARs.

LOO 

